4 S. W. WILLISTON AND E. C. CASE 
characteristic massive sandstones and phytosaur remains, more 
probably so since such fossils have been actually found not far to 
the west. 
_ Cross has reported unconformity of the Red Beds in western 
Colorado, but it has been our experience, wherever we have 
examined them, that they lie conformably throughout, so far as 
stratigraphical evidence indicates. In Kansas, Oklahoma, Texas, 
and eastern New Mexico they seem to be thicker, perhaps reaching 
two thousand feet in their totality. In northern New Mexico 
our observations the present year give a thickness of not over 
sixteen hundred feet, while in the Lander region their total thick- 
ness is fourteen hundred and forty feet, as recently accurately 
determined by Professor Branson. 
More than thirty years ago, the late David A. Baldwin collected 
from the Red Beds of northern New Mexico, which he considered 
of Triassic age throughout, considerable quantities of vertebrate 
fossils, the most of which are now preserved in the museum of 
Yale University, and the remainder in the American Museum of 
New York City. At the time of their collection two or three very 
brief descriptive papers, referring them to the Permian, were pub- 
lished by the late Professors Marsh and Cope, but without giving 
any further information as to the locality of their origin than simply 
New Mexico. Within the past few years the present writers have 
published further notes and descriptions of the remains in these 
collections, with more definite information of their occurrence. 
With more precise information kindly given by Professor Schuchert 
an expedition was planned to explore the region the past summer. 
This expedition, composed of Mr. Paul Miller of the University of 
Chicago and the present writers, entered the field the early part of 
July from Espanola, near the mouth of the Chama River, with 
Abiquiu as the chief base of supplies. Dr. v. Huene was a 
member of the party for three weeks. Abiquiu, one of the oldest 
settlements in the United States, is located twenty-seven miles 
northwest of Espanola on the Chama. It is our pleasure to 
acknowledge with gratitude the kind favors shown us here by Mr. 
Henry Grant.. 
From Abiquiu our entrance into the Red Beds was made in the 
